drop it.

it will cost you less than $5 to get an up to date chip which will have all the memory you need inside. you can do all the external memory stuff and come back a week later with "I am out of port pins, my memory connection used them up"

if you persist, all answers you need will be in "the bible", you can find the links here http://www.8052.com/forum/read/174808

Erik